Method of restoring molding-sand.



C. R. CADY. METHOD OF RESTORING MOLDING SAND.

APPLICATION FILED JAN-24,1916.

Patented NOV. 21, 1916.

amen/tow Ilii a orrioa.

CEYLON R. CADY, OF DE TROIT, lMlIlIGHIG-AN.

METHOD OF RESTORING MOLDING-SAND.

mosses.

To all whom it may concern:

Be it vknown that I, CnYLoN R. CADY, a citizen of the United States ofAmerica, re-

siding at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Methods of RestoringMolding-Sand, of which the following is a specification, reference beinghad therein to the accompanying drawings.

It is the object of the invention to obtain a treatment for molding sandby which the hot sand from one molding operation is quickly cooled andre-tempered to be available for another operation.

Inhe present state of sand is usually used but once in a day, and there-tempering process is one requiring considerable time for cooling anddistributing the proper amount of moisture. Thus in large plants it isnecessary to keep on hand a relatively large quantity of the sand whichis not in use. This is objectionable, both on account ofthe cost andparticularly by reason of the space required for the storing of theunused sand. With the present invention the sand may be so quickl cooledand re-tempered that it is available or practically continuous use,thereby reducing both the quantity required and the space for itsstorage.

In the drawings is shown a diagrammatic.

- vertical section through a form of apparatus adapted for the carryingout of my 1mprovedprocess. I

The primary step in my improved process is the abstraction-of the heatfrom sand which is just removed from the molding flasks. This isaccomplished by passing the sand through a cooling apparatus, andpreferably by subjecting it to contact witha tit cooling air current. Itis, however, essential to guard against the blow away of the dry dustwhich forms the binder for the particles of sand, and I thereforecombine the cooling treatment with a moistening treatment, Furthermore,this moistening a blast of cold air is introduced the hrt Y moldingSpecification of ltetters Patent. Patentd New, 21] 1916;, Applicationfiled January 24, 1916. Serial No. 73,799. v

C. At the entrance end of this casing is an oscillating screen D, whichdistributes the sand and permits it to fall in separate streams, and atvarious'intermediate points in the casing are similar oscillatingscreens D, D and D Connected to the lower end of the casing is a conduitE, throu h which om any suitable source, the air passing upward throughthe series of screens and between the falling streams of sand.

F are pipes for the introduction of moisture, preferably water, which issfirayed by the series of nozzles G G, etc., an is introduced into theseveral compartments intermediate the screens.

With the apparatus as described, the hot dry sand which is raised by theelevator C is passed through the casing A in opposition to the aircurrent, which, coming into intimate contact withthe separate grains ofsand, quickly abstracts the heat. At the same time the water spray willsufliciently moisten the binder adhering to the particles of sand torevent the carrying away of the same by t e air current. Also introducinthis-moisture at a series 0 of points avoids on the one hand the washingofl" of the binder, and on the other hand continuously renews themoisture which is abstracted by evaporation. Thus when the sand reachesthe bottom of the casing A it is thoroughly cooled and may if necessarythen beintroduced into any suitable mmng and tempering apparatus, suchas indicated" at H. Y a

What I claim as my invention.is:

*1. The process of restoring molding sand, comprising the feeding of thehot sand throu h a conduit in one direction, the passtion to thescreened sand and the introduction of moisture.

v 3. The process of restorin molding sand comprising the passing '6 thehot sand through a conduit, screenin the sand at a series of points insaid con uit to separate the same into fine streams, the passage of acooling current of air through said condmt in opposition andtheintroduction of moisture.

4. The process of restoring molding sa'nd, comprising the droppin of thehot sand through a vertical condult, screening of the sand at aplurality of points in said conduit to separate the same lnto finestreams, the passing of a cooling airscurrent through said conduit inopposition to the sand and the introduction of moisture at a series ofpoints;

5. The process of coolingmolding sand consisting in causing the sand tofall within a confined area and in forcing a current of air upwardlythrough said area.

6. The process of restoring molding sand consisting in causing the sandto fall within a confined area, forcing a current of air upwardlythrough said area, and in spraying the falling sand.

' 8. Theprocess of restoring sand consisting in alternately screeningandmoisteningthe same within a confined area and in forcing a current ofair through said area.-

9. The process of restoring molding sand comprising the feeding of thehot sand through a conduit the passage of an air current longitudinallythrough said conduit, andthe application ofmoisture to the sand allowingits passage through said conduit.

' In testimony whereof I affix my signature.

CEY'LON R. OADY.

